Fix for crash in main menu when reflections are enabled

apps/openmw/mwrender/refraction.cpp

@@ -50,7 +50,8 @@ namespace MWRender
 
     void Refraction::preRenderTargetUpdate(const Ogre::RenderTargetEvent& evt)
     {
-        mParentCamera->getParentSceneNode ()->needUpdate ();
+        if (mParentCamera->isAttached())
+            mParentCamera->getParentSceneNode ()->needUpdate ();
         mCamera->setOrientation(mParentCamera->getDerivedOrientation());
         mCamera->setPosition(mParentCamera->getDerivedPosition());
         mCamera->setNearClipDistance(mParentCamera->getNearClipDistance());

apps/openmw/mwrender/water.cpp

@@ -74,7 +74,8 @@ CubeReflection::~CubeReflection ()
 
 void CubeReflection::update ()
 {
-    mParentCamera->getParentSceneNode ()->needUpdate ();
+    if (mParentCamera->isAttached())
+        mParentCamera->getParentSceneNode ()->needUpdate ();
     mCamera->setPosition(mParentCamera->getDerivedPosition());
 }
 
@@ -133,7 +134,8 @@ void PlaneReflection::renderQueueEnded (Ogre::uint8 queueGroupId, const Ogre::St
 
 void PlaneReflection::preRenderTargetUpdate(const Ogre::RenderTargetEvent& evt)
 {
-    mParentCamera->getParentSceneNode ()->needUpdate ();
+    if (mParentCamera->isAttached())
+        mParentCamera->getParentSceneNode ()->needUpdate ();
     mCamera->setOrientation(mParentCamera->getDerivedOrientation());
     mCamera->setPosition(mParentCamera->getDerivedPosition());
     mCamera->setNearClipDistance(mParentCamera->getNearClipDistance());